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You could use a perceptual hash, which would work as long as you had the entire image in any format.

>"I legally (and most likely naively) bought a stock photo CD but did not have that in my possession any longer"

Explain exactly how pissing away all that electricity by burning all that coal and generating all that carcinogenic pollution and greenhouse gas would have caused him to not lose the entire original image just like he lost the original stock photo CD?

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